Repairing Circuit

In this design, wireless radio frequency adopts nrf401 receiving and dispatching chips launched by a Norway company called Nordic. The chip uses 433 mhz ism frequent range. It is the real monolithic uhf wireless receiving and dispatching chip. The 20 pins chip contains high frequency transmitting, high frequency receiving, pll synthetic, fsk modulation, multi-channel chang-over and so on. It is a wireless data transmitting product of the highest integrated level at present. The wireless radio frequency module adopts differential circuit loop-antenna. The load impedance of the antenna end is 380ω. The circuit principle is shown in the above picture. The parameters of the exterior components are listed in the picture, among which, j1 is the interface of the wireless radio frequency module and control module.

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